All “valid arguments against GMOs” are ultimately arguments against capitalistic profit-at-all-costs practises.
When you take the profit margin out of the process, there end up being no valid arguments against GMOs, as all such profit-free GMOs that end up moving to production are there purely to benefit humanity as a whole, and not to restrict said benefit to a rarefied group of obscenely wealthy people. It’s the GMOs with capitalistic roots which are problematic for capitalistic, Parasite-Class-greed related reasons.